Improving the heat protection of the air intake a bit further

 

The golden foil is already a really good solution and solves the idle instability on the warmest days.

But it's really warm to the touch despite the natural cooling of the air blowing through the engine bay.

An infrared measurement of the temperature of turbo body read around 200°C. Heat is transferred by radiation more than convection (which is prevented by the air passing around the intake).

The best protection is a wall between the intake and turbo. A classical way to achieve this is to fit a stamped aluminium plate to cover the turbo and exhaust manifold. The Suzuki R06A engine used here has the exhaust manifold included in the cylinder head by the way...

Inspired by a member of the Sevener.fr forum, I went the other way around and added a 10cm x 30cm piece of stamped aluminium around the intake I'm trying to shield. 

The 30x50cm sheet was received neatly rolled. A 10cm piece was cut using metal shears, the edge deburred with a flat file. I've also filed the corners round for both the looks and not wanting to hurt anyone who has to put his hands under the hood.

It was then formed around a glass bottle to cover 120° around the intake and screwed to a pair of 3D printed spacers. They are made of PETG that can resist 80°C and it might be just enough for the task at hand. If not I will either use a better plastic, or prepare aluminium brackets.

After over a dozen hours driven so far, the plastic brackets seem to do the trick

Total weight around 50 grams with 30g for the aluminium and 10g for each plastic part.